2189381 has 2 divisors, whose sum is σ = 2189382. Its totient is φ = 2189380.

The previous prime is 2189371. The next prime is 2189399. The reversal of 2189381 is 1839812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1876900 + 312481 = 1370^2 + 559^2 .

It is a cyclic number.

It is not a de Polignac number, because 2189381 - 2¹⁴ = 2172997 is a prime.

It is a super-2 number, since 2×2189381² = 9586778326322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2189321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1094690 + 1094691.

It is an arithmetic number, because the mean of its divisors is an integer number (1094691).

2^2189381 is an apocalyptic number.

It is an amenable number.

2189381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2189381 is an equidigital number, since it uses as much as digits as its factorization.

2189381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 32.

The square root of 2189381 is about 1479.6557031958. The cubic root of 2189381 is about 129.8495498157.

The spelling of 2189381 in words is "two million, one hundred eighty-nine thousand, three hundred eighty-one".